US5766054A - Method of manufacturing cathode ray tube - Google Patents

Method of manufacturing cathode ray tube Download PDF

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Publication number
US5766054A
US5766054A US08/700,094 US70009496A US5766054A US 5766054 A US5766054 A US 5766054A US 70009496 A US70009496 A US 70009496A US 5766054 A US5766054 A US 5766054A
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United States
Prior art keywords
ray tube
cathode ray
emission type
field emission
type cold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/700,094
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English (en)
Inventor
Toshio Kaihara
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NEC Corp
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NEC Corp
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Filing date
Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/385—Exhausting vessels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/38—Control of maintenance of pressure in the vessel
    • H01J2209/389—Degassing
    • H01J2209/3896—Degassing by heating

Definitions

  • the present invention relates to a method of manufacturing a cathode ray tube having a cold cathode of field-emission type as an electron beam generating source and, particularly, to a method of manufacturing a cathode ray tube, in which a bulb of the cathode ray tube is evacuated while heating a field emission type cold cathode arranged within a neck portion of the bulb.
  • FIG. 1 is a perspective view showing a structure of a field-emission type cold cathode which becomes an electron beam generating source.
  • a field emission type cold cathode 10 is constructed with an insulating substrate 11 of such as glass, a first electrode 12 of aluminum, etc., formed on the insulating substrate 11, a resistor layer 13 in the form of a thin silicon film, etc., formed on the first electrode 12, an insulating layer 16 of such as silicon oxide (SiO 2 ) having thickness of 0.5 to 1 ⁇ m and formed on the resistor layer 13 and a gate electrode 17 of high melting metal such as tungsten, niobium or molybdenum, etc., or high melting point metal compound having thickness of about 0.2 ⁇ m and formed on the insulating layer 16 as a second electrode.
  • SiO 2 silicon oxide
  • Holes 15 each having diameter of about 1.2 ⁇ m are formed through the insulating layer 16 and the gate electrode 17 and, in each hole 15, a sharp conical cathode 14 of high melting point metal such as tungsten or molybdenum, etc., which has a height of 0.5 to 1 ⁇ m is formed on the resistor layer 13 so that a cavity 15 having small opening width w is formed around the conical cathode 14 in the insulating layer 16 on the resistor layer 13. Therefore, the cathodes 14 oppose to the gate electrode 17 through the cavities 15 and, by applying a voltage of, in this case, several tens to about 100 volts between the gate electrode 17 and the cathodes 14, it is possible to emit electrons from the cathodes 14 without heating them.
  • a sharp conical cathode 14 of high melting point metal such as tungsten or molybdenum, etc.
  • the manufacturing method of the field emission type cold cathode 10 includes the so-called aging step, that is, the step of emitting a required amount of electron within a predetermined time period.
  • FIG. 2 shows schematically a structure of a cathode ray tube 1 having the field emission type cold cathode 10 as its electron beam source.
  • the cathode ray tube 1 includes a bulb 2 having a neck portion 2a in which an electron gun 3 having the field emission type cold cathode 10 is arranged, a fluorescent screen and a shadow mask in a case of a color cathode ray tube, etc. Since the constructive components except the field emission type cold cathode 10 are well known, detailed description thereof are omitted. Briefly, the electron gun 3 is constructed with an anode 4 connected to an anode terminal 4a, a focusing electrode 5, a control electrode 6 and the field emission type cold cathode 10.
  • the manufacturing process of the cathode ray tube 1 includes the step of shielding the bulb, the step of sealing the bulb and the step of evacuating the bulb, in that order.
  • FIG. 3 schematically shows a facility for evacuating the cathode ray tube 1.
  • heaters 21 are arranged on opposite inner walls of an evacuating furnace 20 to maintain an interior of the furnace 20 at a predetermined temperature.
  • the cathode ray tube 1 is transported by a moving hanger to pass through the furnace 20.
  • an evacuating pipe 7 of the bulb 2 of the cathode ray tube 1 is connected to one end of a pipe 24 having the other end connected to a vacuum pump 23 and the bulb 2 is evacuated by the latter.
  • the field emission type cold cathode 10 used as the cathode of the electron gun 3 of the cathode ray tube 1 must have an improved emission characteristics since the bulb 2 is evacuated and heat-treated in the furnace 20.
  • the temperature distribution within the furnace 20 is not uniform and so the field emission type cold cathode 10 which produces electron beams is not heated sufficiently. That is, the field emission type cold cathode 10 can not be heated to a temperature high enough to obtain a good emission characteristics.
  • An object of the present invention is to provide a method of manufacturing a cathode ray tube having an improved emission characteristics.
  • the above object can be achieved according to the present invention by providing means for sufficiently heating a field emission type cold cathode so that the latter can efficiently produce electrons.
  • the method of manufacturing the cathode ray tube is featured by the use of an evacuating furnace having heaters for setting a temperature of an interior of the furnace at a desired temperature and a vacuum pump and the means for heating a field emission type cold cathode arranged in a neck portion of a bulb of the tube.
  • the means for heating the field emission type cold cathode may comprise a neck heater detachably mounted on an outer periphery of the neck portion of the bulb.
  • the bulb is evacuated while the field emission type cold cathode disposed in an interior of the neck portion of the bulb is heated by the neck heater.
  • FIG. 1 is a perspective view showing a conventional field emission type cold cathode
  • FIG. 2 shows schematically a cathode ray tube having a conventional field emission type cold cathode
  • FIG. 3 shows schematically a main portion of a device to be used for evacuating a conventional cathode ray tube
  • FIG. 4 shows schematically a device to be used for evacuating a cathode ray tube according to the present invention.
  • FIG. 4 shows schematically a device to be used in an evacuation process for evacuating a bulb of a cathode ray tube, according to the present invention.
  • a reference numeral 1 denotes a cathode ray tube, 2 a bulb, 2a a neck portion of the bulb 2, 3 an electron gun and 10 a field emission type cold cathode of the electron gun 3 for generating electron beams.
  • a reference numeral 20 denotes an evacuating furnace, 21 heaters for setting temperature on an interior of the furnace, 22 a detachable neck heater and 23 a vacuum pump.
  • the detachable neck heater 22 comprises a pair of halves which, when assembled on a neck portion 2a of the bulb 2, becomes an annular heater.
  • the cathode ray tube 1 uses the field emission type cold cathode 10 as a cathode of the electron gun 3.
  • the cathode ray tube 1 is a color cathode ray tube, three of the field emission type cold cathodes 10 are used.
  • the cathode ray tube 1 is manufactured through a shielding step, a sealing step and an evacuating step.
  • FIG. 4 shows the cathode ray tube 1 in the evacuating step.
  • the feature of the present invention resides in that, in the evacuating step, the field emission type cold cathode 10 of the electron gun 3 is sufficiently heated by the neck heater 22 provided on an outer peripheral surface of the neck portion 2a of the bulb 2.
  • the detachable neck heater 22 is mounted on the neck portion 2a of the bulb 2 of the cathode ray tube 1 while being transported by a moving hanger from a place in which the sealing step preceding the evacuating step is performed.
  • an evacuating pipe 7 extending from the neck portion 2a of the bulb 2 is connected to a piping 24 and the bulb 2 is further transported into the evacuating furnace 20 inner temperature of which is controlled by heaters 21.
  • the bulb 2 is evacuated by the vacuum pump 23.
  • the cathode ray tube 1 passes through the evacuating furnace 20 inner temperature of which is maintained the heaters 21 at 400° C. ⁇ 500° C. for a time period from 2.5 to 3.5 hours.
  • the electron gun 3 of the cathode ray tube 1 that is, the field emission type cold cathode 10 is heated to 400° C. or higher which is high enough to clean the cathode 14 shown in FIG. 1 in a reduced pressure.
  • the manufacturing method of the cathode ray tube comprises, in addition to the conventional steps, the step of heating the neck portion of the bulb 2 by mounting the neck heater on the outer peripheral surface of the neck portion. Therefore, even if the temperature distribution within the evacuating furnace obtained by only the heaters 21 is not uniform, the field emission type cold cathode of the electron gun can be heated to a temperature high enough to clean the cathode to thereby realize a preferable electron emission characteristics. That is, a cathode ray tube having the field emission type cold cathode which has a desired electron emission characteristics as the electron beam generating source can be provided.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US08/700,094 1995-08-23 1996-08-20 Method of manufacturing cathode ray tube Expired - Fee Related US5766054A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7-214420 1995-08-23
JP7214420A JPH0963470A (ja) 1995-08-23 1995-08-23 陰極線管の製造方法

Publications (1)

Publication Number Publication Date
US5766054A true US5766054A (en) 1998-06-16

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US08/700,094 Expired - Fee Related US5766054A (en) 1995-08-23 1996-08-20 Method of manufacturing cathode ray tube

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US (1) US5766054A (ko)
JP (1) JPH0963470A (ko)
KR (1) KR100207336B1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6565401B1 (en) * 1999-07-21 2003-05-20 Mitsubishi Denki Kabushiki Kaisha Cathode ray tube manufacturing method and cathode ray tube manufacturing system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200050787A (ko) 2018-11-02 2020-05-12 한국단자공업 주식회사 부품박스와 박스커버의 체결장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54142882A (en) * 1978-04-27 1979-11-07 Toshiba Corp Method of evacuating bulb
US4231627A (en) * 1978-02-16 1980-11-04 Licentia Patent-Verwaltungs-Gmbh Electron beam tube
US4406637A (en) * 1981-07-02 1983-09-27 Rca Corporation Processing the mount assembly of a CRT to suppress afterglow
US5201682A (en) * 1990-11-21 1993-04-13 Chugai Ro Co., Ltd. CRT exhaust oven

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231627A (en) * 1978-02-16 1980-11-04 Licentia Patent-Verwaltungs-Gmbh Electron beam tube
JPS54142882A (en) * 1978-04-27 1979-11-07 Toshiba Corp Method of evacuating bulb
US4406637A (en) * 1981-07-02 1983-09-27 Rca Corporation Processing the mount assembly of a CRT to suppress afterglow
US5201682A (en) * 1990-11-21 1993-04-13 Chugai Ro Co., Ltd. CRT exhaust oven

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6565401B1 (en) * 1999-07-21 2003-05-20 Mitsubishi Denki Kabushiki Kaisha Cathode ray tube manufacturing method and cathode ray tube manufacturing system

Also Published As

Publication number Publication date
JPH0963470A (ja) 1997-03-07
KR100207336B1 (ko) 1999-07-15
KR970012875A (ko) 1997-03-29

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